Le 08/01/2013 17:50, Andrey Novoseltsev a écrit :
So, what should x*(y > 0) do, raise a NotImplementedError? And x*(y ==
0)? I guess we just special case inequalities.
I hit my students with a cluebat (though only metaphorically... [giant
sigh]) when they multiply an inequality without assumption on the
factor, so I would say either we know something about the sign of x
(three possible signs: 0, <0 and >0) and act accordingly or raise an
exception, perhaps ArithmeticError.
For the equality, there's no problem.
Snark on #sagemath
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